Catalpa midge

The Catalpa midge (Contarinia catalpae) is a small insect species belonging to the family Cecidomyiidae within the order Diptera. Despite its small size, it is recognized as a significant pest of ornamental Catalpa trees, causing noticeable damage to their foliage and growth structure.

This species is highly host-specific, primarily targeting trees of the genus Catalpa. The damage is most severe during the spring and early summer when the trees are actively producing tender new leaves and shoots, providing an ideal environment for the midge's development.

The lifecycle of the Catalpa midge involves females laying eggs into the developing buds or young leaves. Upon hatching, the larvae begin feeding within the tissue, which induces the formation of distorted plant structures. This concealed feeding habit makes the pest difficult to reach with standard surface-applied pesticides.

Damage is characterized by stunted growth, leaf curling, and the development of necrotic, blackened spots where larvae have fed. Heavy infestations can lead to premature leaf drop and overall canopy thinning, which negatively impacts the tree's health and aesthetic appeal in landscapes.

Management strategies for this pest include a combination of cultural and chemical controls. Maintaining tree vigor through proper watering and fertilization is essential. In cases of severe outbreaks, systemic insecticides applied during the early leaf-development phase are often required. Furthermore, practicing good sanitation by removing and destroying infested debris under the trees can help reduce the population for the following season.